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Free Content Nutrient, Chlorophyll and Primary Production Studies in the Florida Current

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Inorganic and total phosphates, Kjeldahl nitrogen, ammonia, nitrite and nitrate nitrogen, iron and silicate have been measured at a station in the Florida current 40 miles east of Miami, Florida in 738 m of water. This station has been occupied at monthly intervals for 31 months. Standing crop and primary production have been measured by chlorophyll and C14 methods for 9 months.

Nutrient concentrations were low in the upper waters. Phosphates and nitrates ranged from 0.0 to 0.3 μg-at P/L and from 0.0 to 10 μg-at N/L. Ammonia and Kjeldahl nitrogen ranged 0.3 to 4.0 μg-at N/L. Silicate was generally not detectable and iron was principally present in particulate state with concentration ranging up to 6 μg/L.

Standing crop ranged from 0.05-0.5 mg, chlorophyll a / m3. Net production ranged from 0.2-0.5 mg C/m3/day.

Factors controlling production in this region and which differentiate it from those of higher latitudes are (1) shallow winter mixed layer, (2) low concentration of nutrients, and (3) a rapid re-cycling of nutrients.

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Document Type: Research Article

Publication date: 1963-01-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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